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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '723b245055a1deb3f09f2253dd561dc9da11e57ac00a7cc53ceaa0ed7c477623' 
  AND token = 'WFDIelCFxheUd20rZClXfyffFeSviFuAgf/vwjb9usw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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