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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc840b43efc362c75c5ed8fcdb72d59b9fc78d6fef447f82b18e0b77ede592f5' 
  AND token = 'Cn1Gi8xhQfK+JRqYhx8V7kdXhMrpkZ0a/TULbKXrp/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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