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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34b1bf4f091853dcff90867d7f37f79832d23e1b28514ab9c857068a797ddefb' 
  AND token = '8SVILIQlhyzNvp4FZZ06b/PrVOy5x8bbVXqbUm3ZztY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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