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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6eb34e6082a74d400a72e7a8a67327483223ccc7e4e2aa6bb18a77f5aafb9667' 
  AND token = 'Bc8vRGx6UJHeYT0ACY/PDH1HC3Yzp5d5hGW1Z9601MI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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