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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7032100a7e3c8c81c45f1e6eb8ed186e966056f123eb010675a5dafd6a10d5d4' 
  AND token = 'DKy2XSLu2XXD5vrbijGnjLYWZFav48kFejqvliXHhSM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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