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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1fc39bf8d0500599e5d4394b8aa1f6ce2a52a54725785b52f0b5609a90e88ca' 
  AND token = 'n+v4XERni3EdEjkLqaERbzNQvoiRXk67p0EZ4MVweig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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