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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13db9b3712e5148113f12a93c95e843ed1d693ff83a10abedcac90a6800ab30b' 
  AND token = 'PewPDO+XDegPx83upoWUSoa1/18pefDGBQVil8n/tgg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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