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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44f3e87c7c4bc52d53a9e6245748f9090f7a212e33cd65aaa2d0ec2b1460c357' 
  AND token = 'fKMoiwPcQDwYHnm3AL6ebWi3rNbRwJxxoHFJQ7fc8I4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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