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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f214717874c2f42d98f65ffc01847f969db351364b6a537fe2ab4ab9b944cf15' 
  AND token = 'Wbf9U2zV7GrAYvVqxz0N/2BIksmTOLd42XtQGY18WS4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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