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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4e829e0723f1d83e8d4f033e1737b1fd26987f87a4f0f282e3e17efbe112e75' 
  AND token = 'NF2cJUOQPb0eleo7gK/GSPEo0YtZW2h6y4cEVzBZtH0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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