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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e5587e52cfad68c126b11664da17e2f412a41f9275c23104f4bf4e434abb97a' 
  AND token = '3OiFF1dGjO+RDedWpj6kCSMNGL2+NUe/ozIpPHAdUwM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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