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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '147c911d4c8f542855a25cf0722341809639dca895101bd69bbcd04b666c32bc' 
  AND token = 'UDKb5dhGnvgb8De03D/yN37lh8G7JQrrN9lUQI/MxXA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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