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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '367ddffb30a9fd1fd21e2b38e2d6ac2b97d8e76d0d157c7b46bdbf611c02bd82' 
  AND token = '5EL+CrYYucHg7iJyHu5HLoGB+Ln/rrUPJUmMwcCLt8c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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