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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb3a600a710c27c3bebfa5cbd51c9e9382c83ab7d39da9d8d9c5f39ff12aff00' 
  AND token = 'Ezhe/q5+YIcmC9c60HTuYRl4kfUWPP9VtHnhQ3xrtc8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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