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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75bd2ff14aa6f2ec5439079277864c175989912ae83d0c36fb2fd96baad1032f' 
  AND token = '0lJQiHkpB2ejCfa+3p0mkkbtTgC8QWiGGjDt6jut1dA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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