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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c4ce6285ef672f12dabb629a7ae0576c4fe6f8917edb8b7fc56156c46e34fb9' 
  AND token = 'ibfEc/YA9XXr2lCOJp2AAoogFe7d7VY+iAcq3k8KWuY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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