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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93e21a012ffbf9de30badcc3688daa2236d256e7cead27f2a319a88c9fd641f3' 
  AND token = 'VIDENlsyrJwv4zdWPnHsnP2tkysk4jsKIoPcX+SoYkg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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