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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6e6a61c8db6dd57ac76d7aaed6e89ea9feacaa8d8e48d1b22ee299945d506c6' 
  AND token = 'TmDqBZAlCdIRvNGMkD+ajU9DbCExM7/89YeTl6smmBs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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