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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac5aa966a323cf573d7cb1ae6da16f7ae02f2ea3f6296337a62023d52512754a' 
  AND token = 'qRKobjAhu8PDMZsFQK9nmZLAtpJx/dIx7qUr45jCnLE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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