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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd76f2ee33f84b991dfe915237ee9e9821e1c2dbc4bd98a03901ecccca9a44ecc' 
  AND token = 'mBAyCuN2T3PAt8AEYx2Xg6DxGX483PgwcAfcIvzFnFw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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