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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b37bdf0a00278c26a69c38a3aafe733c6f677aff6d2c79f01c0ce8c2632afde' 
  AND token = '7k98OtRryMfcm9Bcs07q7n2qcU6vFR+jSyuT34DRWXo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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