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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a8fc89034f126512c85040bc4e5a0a0747027af7665c32ba71c83f1fddc6814' 
  AND token = 'WfIpeJjKOuVeynyvIrqaR1ZAudmwCwAmE5NZ05D8r+w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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