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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '636d8c386fd81d5175508cb00d596cac7f6b2d4536a2d03e81471a62fb1c8a68' 
  AND token = '8tBnTqK1LP6PqhPA7mC/8Psax3VR4WoxYAJdoQnYlNo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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