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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '739ddb6ef70d603746e5923a914cdf637171f472bdd10229d6eb43653ffe88ca' 
  AND token = 'lbrl7RlYdXxLPxydXyIIWM+SLjTr3etVYFyU8Ij1Ip0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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