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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '971efc03461aa7b8d8368ebca82e383ac9c3465d1772da23d8f852eea17491ac' 
  AND token = 'Z3tYuCVptiii5X093pCsiGvkR8oh1kDPWRLgH7XXO1w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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