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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9bdaf81ebdf6c2fb1120992a59d6be8f49707de4b8cbf7196b387e5a16c534b' 
  AND token = 'ITqmWEJUg7bW248o572QaQxDpPC+Dn7cxAbgGAR4tro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}