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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0dbcc953b6b9b1af17d2421eb4328c15e83823ec679b7642be93e69bb35a704b' 
  AND token = 'H+HAmCl+x9RM6RUroo+rpT4j8dg/DlJQG/9FZkSzFEY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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