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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9323ce34f46a6aeee2434d91412f8816786cb527711e1ce45737130db0b1aaac' 
  AND token = 'RT5t7Gkx0VQuIWgJEWnXN6jHubCVXn1EBty9LqrIO50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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