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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90bdff8213e731cda2dd58b7836dcdd1b9e78c56921f7ba7dd5d4eb13bd52410' 
  AND token = 'dDFB4komFfKujYC9mbCtF+/OYmqSJefJlN57A01D3Ic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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