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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a299b388edb3972165b4f4c584fcfdffd036795dd009d21601b47b5df1f2ff8' 
  AND token = 'xj7QkF/KUXHeILX8AS+kVlCwNeBd2kfI7ocEVEIbBe4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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