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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '562dd1005c827aa14351c71db2ffe8e6f9b2425bdc5f1c23a83d0a4a4e4c63af' 
  AND token = 'mHHquRPiTdr56UKiehCMva+pYhP48CQFZb5dSehd5xE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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