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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'acccc859e053ea4b62be27c7039ce5ce69f1cad49155792b711fc08a1c173909' 
  AND token = '1hUhzy61f12aubxOl01P9hduVW3BG9z2462sB2aWcps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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