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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '652c86f3b50655861c5da7bfe06249ad4b4581715462bb4ca70f258d4a3abee6' 
  AND token = 'uV2uzZ6ZfCTk7c12GiDP4yNFpBr/PMb6zZlXJgOX0J0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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