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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e697ce0d5ff32319e569ee077b88298f8c4aafe75991c6638d9171fdc0b8aea' 
  AND token = 'jSZRln8bepcIJpHODvZLOblGs5h4wvy2S35iekJKp4c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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