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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f38e943a5671295b312630238f9fa9164d90a89d96170f3413e69519e56eb508' 
  AND token = '6uBTUDdGZVRR78QJRqs3yOaIZ/bn0ULCHHN5P1bcf2k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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