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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec8673930efe02cdcbaf283e2b8c4a3be25eb48c9a9994ebaf0b2ab512828731' 
  AND token = 'bKAuckm2kjLLVzaoYo03kjiQ3DUBg4sw4xqIJj3YlmU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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