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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9638bc24692f8fa09b794eea61d4fca53280d17dc4846cba9d41adcc8a33fe6' 
  AND token = 'SQSv6eQ8y0p+h3Kc5mtZeiR9PxXzBAgjCikO54CthwA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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