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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1acf09e2ce16d19378c1d12b20c5865020ecf4ddf9535bf22f2b5f6346e4ebe3' 
  AND token = '3AVHpknxESZtAKmrkuk3k5xMeR7FcNHA/YJA/tgZass=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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