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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ac4ccca63ae35c0c99404f9c4ba45e1b38483c80b0bcc3ed2ebebc5e735ae28' 
  AND token = 'yL3I/w5L76BiscyDgl6LjfRVvfx7z0h45w6bWwx5ZPs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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