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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c73ac030f49f4260cc489b82ed3e921031ab0c2c240b6c1325ed47d339408cb' 
  AND token = '2qiSZbQq30NVhHtzU8orSuvCamx05Fg/vWXbq7lsaY8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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