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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1336b828fb2b76f9428a9539ca76fc66ddea0c481b75151f112bcd4282cb2e81' 
  AND token = 'j2ZpH67dGZV5icAHX8lL8RfGaMI/358ktB942tGO/s0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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