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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddd0004fa395a6ec8c64a84bbfcbb0874fc5135a9fd9b752d16f6b015f58211c' 
  AND token = 'tVAog4ZqIjs5n9qDxotxFxm8NlLecRzLGdB14eQGqgE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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