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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4aa71a83c53c492b0a6a317eb3405acf27b9ed5533b062b371a9ce2f7ed3d8c4' 
  AND token = 'ge5XgjBgTHd5SmL1nVZb76TysVhmG4vz6Z/N9zxU40E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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