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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a01f86a1505a29bdf5a6a43fffd52d9b4750345b5935c77ae630e520e1499f3' 
  AND token = '2k4MfF6G/C2IpjrX7q2mEYsIEcgIOKYS/7/ClnWstKI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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