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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c4831c1482070d34b4da8e97020616ee4ca210f70d0062fce2d3fb9d2579677' 
  AND token = '4pUPXrljgcQJPnnjvkHh781pK61i5Cb8AL9ngYFG70k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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