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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8ef6fe5ae5c5e907030d5c5914d0feafd299c05692f0ceca750f5221bc3548f' 
  AND token = 'MBHjTKyKUQ6BSoNl3PZ+zH2rmVOs7onQ6FUjmTHr7D4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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