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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0da92111d7a80073a2b5757114cc52dd20ca4c83b2cc53e764da6fa1e43a8b52' 
  AND token = '3E+CZEWRYFvlzhTvWdGe/Vahh4Sdf+FxLAddZjBIrFs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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