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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b96f273b61b81371f7ccd66eb10c33f778322ed0fdab96c386992f35523e6a3' 
  AND token = 'B6wVmImxjPOEkxs7hd33D13nP2hjPrbNUw02TgRu8t8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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