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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a49fe4f06588b0edb2170590c75e37b5aa9251e5dc291a18827c84fb158461e' 
  AND token = 'ZBdHYcn8TIZ9YOqB2bQ98BiqtH7wlVq4XBE2nXb048Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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