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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae0ccfc6fa3ae87fde56043040b6c4dbe482cefadf565f5e50ffedb3e67c764f' 
  AND token = 'ugzBRV6Le157syQS3KEbIYE6oD2E4Fv2TnSsK6rqf8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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