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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aafaaf2dbcfeaa38124f12ee3dab5361d46a4328f0fca9aaa27fcb2dd755a183' 
  AND token = 'huyN1h3RcASY8+SYnFXaF8wbCGy5U6oK8dHxlV5MwGk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00100

JSON explain

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