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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36c611d44ac3f95938616f10ee08ed2ff702e9fc03744abe9c04a55ac62e8f7f' 
  AND token = 'L1g6Ln0auHlyUKPPN303JFOZPAHtgFyBysVu9j1cCHI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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