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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4aa208e9c7e82f46693b5237379596f4ba1d6290950ab05a77d71ac14b6ea08' 
  AND token = 'weYB7s6stVEzvqvFxNT8WbpqZ9ETXG9Z+7eG2Mouk3c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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