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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bb3299d3c9879963715c7d0c7a95f9c2f11d8ff39b65792f628dc0ff1a99c19' 
  AND token = 'x7FEIo60qbnLz+LUpEzZgl9rwJLLme6yACr6Wr7DRNw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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