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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '598c7b7f3f4635f7d9593594ea7d8c349b7432e920ba655c74caf533250add7b' 
  AND token = 'bKw77aPSVT8PVBowYqqNJJyh5C1gi3mAP7avQVTiucU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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