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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8e619c11197b909210fb7b3cde99e3cabcc6419a41217e958f5a95e9cff38e3' 
  AND token = 'cizkr3AK4DnAiwBCxGJyVsDsVmXX8pp0wNmqXuJLn40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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