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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '122baa76dd590effd6a47f18ff2dc216c84900422e5c57b6e7442d6042e8c2de' 
  AND token = 'LwpLxOKRU16l9/4GRebjjyEgDwuZ5rsACNPPEKh8+bY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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