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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c9149998590de1d592e3ea0a8629143303a8aac8566383d1b9a512b05cb0644' 
  AND token = 'rI3W0WC48ePKNgx6ZOL9Paq1WIlLeLmWJJDgorNZ8hM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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