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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '692afaed325b2473801e025f344b812d8804911c04cb1d8c5ba648ce3db7c524' 
  AND token = 'td3J3lDImdFTbTxMJy3aAISqB39Sm1sewOcdSso1tVE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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