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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbe70e65df0ded0abc1ab47651b9d00598063cf259752e2e9da4e7d1ebc090b0' 
  AND token = 'ZWVBiuUpS+GADc67Y/L+VPAeqIk9iCZ6tS290mwg61E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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