SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36a1f86b4977d25fa164b41c5daa0c8dead1273b9b3dfc30937f46029462a6a8' 
  AND token = 'UJJqsdjPkgwi8rOX58++vCfadv0N1QSQjIM0/wCCPWY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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