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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6330029811b6b33c1a93052bb0302412707ea17b698ed498cf6164689a1aaa02' 
  AND token = 'Tt58duSaVP5oHq+Li3j7aIRS5IXuc5cOjau4WjLPSEg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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